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An OC12 is the abridged term for Optical Carrier level 12 (OC-12), used to dictate the speed level of fiber optic networks. The OC12 speed is measured through SONET or otherwise known as Synchronous Optical Network standards. A T1 can transmit bandwidth at a rate of 1.544 megabits per second and has 24 DS0 lines DS0's transmit data at a rate of 64,000 bits per second or 64 Kbps and is a channel within a T-Carrier Circuit like a DS1/T1, DS2/T2, DS3/T3, DS4/T4 or Optical Carriers like an OC-3. In the 1980s speeds of up to 10 Mbps Ethernet Version 1.0 specification was developed. Packets are forwarded along a Label Switch Path or (LSP), where each label switch router (LSR) prioritizes each label whether it be Data, Video, Voice, etc. solely based on the contents of the label. The Optical Carrier (OC) is multiplied for use by other OC-n standards. For illustration purposes, an OC-3 Line is 3 times the rate of OC-1 Line The Four OC12 Layers are the (1) Photonic Layer, (2) Section Layer, (3) Line Layer and the (4) Path Layer. Codec G.726 transmits at 16 Kbps, 24 Kbps, 32 Kbps and 40 Kbps which is an improved version of G.721 and G.723 but different from Codec G.723.1 OC-3c as mentioned above concatenates (3) STS-1(OC-1) frames into a single OC-3 mirrored stream of data |
